## Thursday, November 10, 2011

### Josh L's Graphing Post

Bar Graph

Advantage: it compares data across categories
Disadvantage: it can only compare one set of data and depending on the intervals, it can be inaccurate

Double Bar Graph

Advantage: it compares two sets of data across categories
Disadvantage: it can only compare a couple of data and depending on the intervals, it can be inaccurate

Line Graph

Advantage: it compares changes in data over time
Disadvantage: the types of data mostly used are the ones that had changed over time

Circle Graph

Advantage: it compares categories (parts) to the whole using percents
Disadvantage: it takes a long time to make and very complicated to construct

Pictograph

Advantage: it compares data that can be easily counted and represented using symbols
Disadvantage: when the symbols are cut, you can't tell how much of the symbol they have taken off

2. How can graphs be misleading. Show 3 ways.
• Putting a break on the y-axis
• Distorting the visuals (making a visual/symbol larger than the rest)
• Distorting the the size of a bar (making a bar wider/ putting more area inside a bar)
3a. The following chart shows Pizza Sub Sales over a month. What 2 graphs would show the information accurately?

A line graph and a bar graph

3b. If you were selling Pizza Subs would you continue? How does your graph explain your answer.
Yes, I would continue selling Pizza Subs. This would be my answer because when I look at my graph, it shows me that they are selling more every week.

4a. Below you see 2 different examples of graphs showing healthy choices sold at the canteen. If you had to convince Mrs. Mota that we should continue selling healthy choices which graph would you choose?

I would choose the line graph because it looks like the canteen is selling more each month.

4b. Change each graph so that your information looks even MORE impressive. You may not change the data just the graphs.

Here is a video saying what a graph is in the simplest way:

Here is a site to play graphing games. It's really fun!
http://www.bbc.co.uk/schools/ks2bitesize/maths/data/frequency_diagrams/play.shtml